PowerScale OneFS 9.8.0.0 Web Administration Guide

Data failover

Failover is the process of preparing data on a secondary cluster and switching over to the secondary cluster for normal client operations. After you fail over to a secondary cluster, you can direct clients to access, view, and modify their data on the secondary cluster.

Before failover is performed, you must create and run a SyncIQ replication policy on the primary cluster. You initiate the failover process on the secondary cluster. To migrate data from the primary cluster that is spread across multiple replication policies, you must initiate failover for each replication policy.

If the action of a replication policy is set to copy, any file that was deleted on the primary cluster will still be present on the secondary cluster. When the client connects to the secondary cluster, all files that were deleted on the primary cluster will be available.

If you initiate failover for a replication policy while an associated replication job is running, the failover operation completes but the replication job fails. Because data might be in an inconsistent state, SyncIQ uses the snapshot generated by the last successful replication job to revert data on the secondary cluster to the last recovery point.

If a disaster occurs on the primary cluster, any modifications to data that were made after the last successful replication job started are not reflected on the secondary cluster. When a client connects to the secondary cluster, their data appears as it was when the last successful replication job was started.